JP4526520B2 - Industrial waste melting treatment equipment and industrial waste melting treatment method - Google Patents

Description

  The present invention relates to an industrial waste melting treatment facility and an industrial waste melting treatment method, and more particularly to an industrial waste melting treatment facility and an industrial waste melting treatment method for detoxifying industrial waste mainly composed of asbestos. .

Asbestos consists of chrysotile (white asbestos: Mg ₃ Si ₈ O ₅ (OH) ₄ -melting point 1521 ° C.), crocidolite (Ao Asbestos: Na ₂ Fe ₅ Si ₈ O ₂₂ (OH) ₄ -melting point 1193 ° C.), and It is a generic name for amosite (tea asbestos: (FeMg) ₆ Si ₈ O ₂₂ (OH) ₂ ). Asbestos is a fine fibrous needle-like crystal that is known to cause damage to the respiratory tract, such as cancer, when sucked into the human body. For this reason, it has been disposed of by landfill treatment, etc. after sufficient anti-scattering treatment so far, but because of its strong carcinogenicity, it is not buried in the soil but detoxified by means such as melting. There have been various proposals.

  As a conventional asbestos treatment method that has been proposed, for example, the treatment method disclosed in Japanese Patent No. 3085959 is not a method of treating asbestos itself, but a method using a binder. The processing method disclosed in Japanese Patent Laid-Open No. 7-171536 has a problem that a large amount of expensive electric power is required because it uses an electric furnace. Therefore, the applicant of the present invention charges industrial waste such as sludge, iron slag, husk, printed circuit board, pad scrap, waste catalyst, metal scrap, waste shot, grinding scrap and dust into a horizontal furnace and installs it in the furnace. Invented and proposed a detoxification method for asbestos characterized in that it is melted by the burner formed to form a slag bath in the hot water pool, and asbestos is introduced into the slag bath and dissolved in the slag bath ( JP 2003-181412 (Patent Document 1)).

JP 2003-181212 A

According to the asbestos detoxification method proposed in Patent Document 1, asbestos can be effectively detoxified without using an auxiliary agent such as a binder or CaF ₂ , electric power, or the like.
However, the asbestos detoxification treatment method proposed in Patent Document 1 is an industrial waste mainly composed of asbestos in a melt obtained by heating and melting industrial waste by a side burner provided on the short side of the melting furnace. However, it was difficult to melt a large amount of asbestos because it was far away from the side burner. In this case, if the inside of the furnace is heated with a side burner in an attempt to process a large amount of asbestos, the refractory disposed on the furnace ceiling or side wall may be damaged.
In addition, when a high-melting-point material precipitates in the melt, the melting zone becomes narrower, and thus, Fe and S in the melt are burned and dissolved by blowing oxygen with an oxygen lance. It was a necessary work. In addition, the melt thus obtained has a high viscosity and entrains the separated copper, and thus has to be treated repeatedly.

Therefore, the present invention solves these problems, can process a large amount of industrial waste mainly composed of asbestos than before, and can also stably treat high melting point waste. An object of the present invention is to provide an industrial waste melting treatment facility and an industrial waste melting treatment method.
It is another object of the present invention to provide an industrial waste melting treatment facility and an industrial waste melting treatment method that can reduce fuel consumption per throughput compared to conventional treatment methods.

In order to solve the above problems, the present invention according to claim 1 includes a side burner disposed at one end of a melting furnace, sludge, iron slag, burning husk, printed circuit board, pad scrap, waste catalyst, metal scrap, waste shot, A hearth at a position where waste is charged at an inlet provided at the upper part of the melting furnace for charging waste such as grinding waste and dust, and a furnace bottom located on the opposite side of the side burner A hot water pool portion formed lower than the hot water pool portion, in which a slag bath is formed by a melt of waste melted by a side burner, and a central ceiling of the melting furnace located on the upper side of the hot water pool portion Equipped with an inlet for asbestos-based industrial waste, and two or more oxygen burners placed on the ceiling of the melting furnace across the inlet. Waste is melted by the side burner to the sump Forming a lug bath, the high temperature portion than 1,500 ° C. to radiation to melting furnace the flame toward the slag bath by oxygen burner while introducing industrial waste from the upper main asbestos of the slag bath By forming locally, the temperature of the slag bath is set to 1,350 to 1,400 ° C., and industrial waste mainly composed of asbestos is melted directly into the slag bath by the heat reflected on the inner wall of the furnace . Provided is an industrial waste melting treatment facility characterized by the above .

In order to solve the above-mentioned problem, the present invention described in claim 2 is the industrial waste melting treatment facility according to claim 1, wherein the oxygen burner is configured to be capable of changing the radial direction of the soot. It is characterized by.

In order to solve the above-mentioned problem, the present invention according to claim 3 is a method for treating sludge, iron slag, husk, printed circuit board, pad scrap, waste catalyst, metal scrap, A hearth at a position where waste such as waste shots, grinding scraps and dust is melted by a side burner disposed at one end of the melting furnace, and the bottom of the furnace located on the opposite side of the side burner is charged with waste. A slag bath is formed in a hot water pool that is lower than the upper part of the slag bath, and industrial waste, mainly asbestos, is fed from the inlet provided in the center ceiling of the melting furnace located on the upper side of the slag bath. A slag bath is formed by radiating firewood toward the slag bath by two or more oxygen burners arranged on the ceiling of the melting furnace across the mouth to locally form a high temperature portion of 1500 ° C or higher in the melting furnace. The temperature of 1,350 to 1,40 ℃ with the, industrial wastes mainly containing asbestos directly, and provides industrial waste melting treatment method characterized by melting the slag bath by the heat reflected from the furnace inner wall.

In order to solve the above-mentioned problem, the present invention described in claim 4 is characterized in that, in the industrial waste melting treatment method according to claim 3 , slag is lower than the melting point of industrial waste mainly composed of asbestos. To do.

In order to solve the above problems, the present invention according to claim 5 is the industrial waste melting treatment method according to claim 3 or 4 , wherein the slag is copper smelting slag.

According to the industrial waste melting treatment facility and the industrial waste melting treatment method according to the present invention, it is possible to process a large amount of industrial waste mainly composed of asbestos than before, and in addition, waste with a high melting point. Therefore, there is an effect that processing can be performed stably. Further, since a high melting point melt containing asbestos is melted into a low melting point slag or the like, there is an effect that the product can be made stable in properties.
In addition, there is an effect that fuel consumption per processing can be reduced as compared with the conventional processing method.

  Hereinafter, an industrial waste melting treatment facility and an industrial waste melting treatment method according to the present invention will be described in detail with reference to the drawings. First, the industrial waste melting treatment facility according to the first aspect of the present invention will be described, and then the industrial waste melting treatment method according to the second aspect will be described. FIG. 1 is a side sectional view showing an embodiment of an industrial waste melting treatment facility according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front sectional view thereof.

  The illustrated industrial waste melting treatment facility 1 is formed based on a reflection furnace which is one of horizontal furnaces. The reflection furnace is used when producing either a mat or metal, and is also used for dry refining of metal. The inside of the reverberation furnace is mainly constructed of basic heat-resistant bricks 10 such as magnesite and chrome magnesite. Three burners 15 are arranged in one horizontal row at one end of the furnace short side of the industrial waste melting treatment facility 1. The burner 15 is configured to blow out a long soot 16 toward the furnace by burning fuel such as heavy oil, waste oil, natural gas, or the like. On both side portions on the upper side of the industrial waste melting treatment facility 1, charging ports 11 and 11 for charging the industrial waste 40 into the furnace are provided side by side along the longitudinal direction. The industrial waste 40 charged from the charging port 11 is melted directly or by the heat reflected on the ceiling or inner wall by the gutter 16.

The industrial waste 40 to be charged is sludge, slag, burning husk, printed circuit board, pad scrap, waste catalyst, metal scrap, waste shot, grinding scrap, dust, and the like. Here, “sludge” is “dehydrated sludge”, “plating sludge”, “polishing sludge”, “sewage sludge”, etc. “dehydrated sludge” is mainly composed of Ca and Fe. “Plating sludge” contains Cu, Fe, S, and Ca as main components. In addition, “burning husk” is incineration residue and the like. “The“ printed circuit board ”is made of Cu and plastic. “Slag” is Al ₂ O ₃ powder or the like, and “pat waste” is a brake pad or the like. “Waste shot” is waste material such as shot blasting particles. “Dust” is dust. When the object to be processed contains valuable metals, iron sulfide can be added to produce a mat, and the valuable metals can be captured in the mat. In addition to sludge and the like, industrial waste that can be reused as slag can be treated.

  The furnace bottom part of the industrial waste melting treatment facility 1 is a hot water reservoir 13 in which the furnace bottom part opposite to the burner 15 is formed lower than the furnace floor part at the position where the industrial waste 40 is charged. In the meantime, the surface is inclined. Thus, the industrial waste 40 melted by the burner 15 flows through the bottom of the furnace in a molten state, and accumulates in the hot water reservoir 13. The molten industrial waste 40 accumulated in the hot water reservoir 13 is separated into a mat bath 3 having a high specific gravity containing valuable metals and a slag bath 5 formed in an upper layer thereof.

On the other hand, a charging port 20 for introducing industrial waste 50 mainly composed of asbestos is provided on the ceiling of the central portion of the furnace located on the upper side of the hot water reservoir 13 where the slag bath is formed. A ceiling burner 25 is disposed in the vicinity of the inlet 20. The ceiling burner 25 is an oxygen burner. Since the oxygen burner does not contain nitrogen that does not contribute to combustion, such as air, since the combustion supporting gas for burning the fuel is oxygen, high-temperature combustion is possible. Then, fuel such as heavy oil, waste oil, and natural gas is supplied to the ceiling burner 25 and burned to locally form a high temperature portion of 1,500 ° C. or higher in the melting furnace. As a result, the industrial waste 50 mainly composed of asbestos charged from the charging port 20 is melted directly into the slag bath by the heat reflected on the inner wall of the furnace. Moreover, since the ceiling burner 25 radiates a soot toward the slag bath located on the lower side from the ceiling of the furnace and locally forms a high temperature part, it can give a thermal load to the side wall and the ceiling part of the furnace. It is also possible to maintain a long service life of the equipment. Furthermore, the ceiling burner 25 is formed so that a radiation port (not shown) can swing, and the radiation direction of the basket can be changed. On the other hand, the industrial waste 50 containing asbestos includes a hardly-melting asbestos containing a binder, such as slate, asbestos packing (non-scattering asbestos waste), and a high melting point, but the sump 13 By providing the inlet 20 on the upper side of the wall and disposing the ceiling burner 25 in the vicinity thereof, such hardly fusible asbestos can be effectively melted, and the hot water reservoir 13 can be kept larger. Is possible. Further, the ceiling burner 25 is not limited to one, and a plurality of ceiling burners 25 can be arranged. For example, as shown in FIG. 4, two ceiling burners 25 can be arranged at predetermined intervals on both the left and right sides of the insertion port 20. In addition, it is possible to arrange not only two but more.

Here, as the slag bath, a copper smelting slag having a low alumina content, for example, a blast furnace slag or a flash slag can be used. The composition of blast furnace slag and a flash smelting furnace slag, as a _{general, SiO 2: 30~35%, FeO} : 25~30%, Fe 3 O 4: 5~10%, Al 2 O 3: 4~8%, CaO : 10 to 15%, and its melting temperature is 1,075 to 1,125 ° C. In this respect, although it has a lower melting point than industrial waste 50 mainly composed of asbestos, the main component of asbestos is basic MgO, and when it comes into contact with acidic SiO ₂ or the like, a compound having a low melting point is produced. . As a result, even industrial waste 50 mainly composed of high melting point asbestos having a melting point exceeding 1500 ° C. can be dissolved in slag having a lower melting point, and the melt as a whole has a low melting point composition. can do. Since this melt has a low melting point, it has good separability from copper, and can be granulated and commercialized as slag.

Next, the industrial waste melting treatment method according to the present invention will be described together with the operation of the industrial waste melting treatment facility 1 described above. FIG. 5 is a flowchart of an embodiment of the industrial waste melting method according to the present invention.
First, waste 40 such as sludge, iron slag, burning husk, printed circuit board, pad scrap, waste catalyst, metal scrap, waste shot, grinding scrap, dust, etc. from the inlet 11 provided at the upper part of the industrial waste melting treatment facility 1 Is charged. And it melts by the side burner 15 arrange | positioned at the side wall of a furnace, and forms the slag bath 5 in the hot water sump part 13 (step S1). Industrial waste 50 mainly composed of asbestos is charged into the formed slag bath 5 from the charging port 20 (step S2). At this time, an industrial waste 50 mainly composed of asbestos is formed in the slag bath 5 by locally forming a high temperature portion of 1,500 ° C. or higher in the melting furnace by the ceiling burner 25 disposed in the vicinity of the inlet 20. Melt (step S3). The industrial waste 50 mainly composed of asbestos charged into the slag bath 5 is melted and rendered harmless.

The results of comparing the treatment results before the implementation and the treatment results after the implementation of the industrial waste melting treatment facility and the industrial waste melting treatment method according to the present invention are shown below. This example was performed using one ceiling burner.
[Asbestos throughput]
Before implementation: 1t / day After implementation: 4t / day [Heavy oil consumption]
Before implementation: Side burner; 750-900 liters / h
: Ceiling burner; None After: Side burner; 750-850 liters / h
: Ceiling burner; 50 liter / h x 1 [Oxygen consumption] (95% oxygen)
Before implementation: Side burner; 700 to 800 Nm ³ / h
: Ceiling burner; None After implementation: Side burner; 700 to 800 Nm ³ / h
: Ceiling burner; 100 Nm ³ / h
[Dissolution by oxygen lance]
Before: 1 time / day After: 0-2 times / week [damage of side walls and ceiling bricks]
Before implementation: 300 mm / year After implementation: 150 mm / year [Asbestos injection cycle]
Before implementation: 50kg / 2 hours (batch)
After implementation: 100 to 200 kg / 2 hours (batch, continuous)
[Slag temperature]
Before implementation: 1,300-1,350 ° C
After implementation: 1,300-1,350 ° C

  As described above, after the implementation of the present invention, industrial waste containing asbestos can be treated in a larger amount than before the implementation. In addition, after the implementation, even with the same amount of heavy oil used, the daily throughput was four times that before the implementation. In addition, the melting work using an oxygen lance, which required work once a day before the implementation, was at least once a week, and the burden on the worker was greatly reduced. Furthermore, the degree of damage to heat-resistant bricks was reduced to about half after the implementation.

Next, a comparison between the processing results before the implementation and the processing results after the implementation when two ceiling burners are used is shown below.
[Asbestos throughput]
Before implementation: 1t / day After implementation: 7-8t / day [Heavy oil consumption]
Before implementation: Side burner; 750-900 liters / h
: Ceiling burner; None After: Side burner; 750-850 liters / h
: Ceiling burner; 50 liters / h x 2 units [oxygen consumption] (95% oxygen)
Before implementation: Side burner; 700 to 800 Nm ³ / h
: Ceiling burner; None After implementation: Side burner; 700 to 800 Nm ³ / h
: Ceiling burner; 100 to 200 Nm ³ / h
(50-100) Nm ³ / h (per unit)
[Dissolution by oxygen lance]
Before implementation: Once / day After implementation: 0-1 times / week [damage of side walls and ceiling bricks]
Before implementation: 300 mm / year After implementation: 150 mm / year [Asbestos injection cycle]
Before implementation: 50kg / 2 hours (batch)
After implementation: 300-600 kg / 2 hours (batch, continuous)
[Slag temperature]
Before implementation: 1,300-1,350 ° C
After implementation: 1,350-1,400 ° C

  As described above, when two ceiling burners are used, the amount of processing per day is approximately twice the amount of heavy oil used compared to the case with one ceiling burner. It became about 8 times. The slag temperature was also higher than when one ceiling burner was used, and industrial waste containing asbestos could be processed in a larger amount than before the implementation. Further, the melting operation with the oxygen lance does not affect the operation even if it is not performed for more than one week, and it may be performed about once every few weeks, and the burden on the operator is further reduced as compared with the case where there is only one ceiling burner. In addition, the degree of damage to heat-resistant bricks was reduced to about half after the implementation.

It is side surface sectional drawing which shows one Embodiment of the industrial waste fusion processing equipment which concerns on this invention. It is a top view of the industrial waste melting processing facility of FIG. It is front sectional drawing of the industrial waste fusion processing equipment of FIG. It is front sectional drawing of the industrial waste fusion processing equipment which provided two ceiling burners. It is a flowchart which shows one Embodiment of the industrial waste melting processing method which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Industrial waste fusion processing equipment 3 Slag bath 5 Mat bath 10 Heat-resistant brick 11 Loading 15 Side burner 16 焔 20 Input 25 Ceiling burner 26 焔 40 Industrial waste 50 Industrial waste mainly made of asbestos

Claims (5)

A side burner arranged at one end of the melting furnace;
An inlet provided in the upper part of the melting furnace for charging waste such as sludge, mines, husk, printed circuit board, pad scrap, waste catalyst, metal scrap, waste shot, grinding scrap, dust,
A waste pool melted by the side burner, wherein the bottom of the furnace located on the opposite side of the side burner is lower than the hearth at the position where the waste is charged. A basin where a slag bath is formed,
An inlet for charging the industrial waste mainly composed of asbestos provided on the ceiling of the center of the melting furnace located on the upper side of the hot water reservoir;
Two or more oxygen burners arranged on the ceiling of the melting furnace across the charging port;
With
The waste charged from the charging port is melted by the side burner to form a slag bath in the hot water pool, and the oxygen is introduced into the slag bath while industrial waste mainly containing asbestos is added. and 1,350～1,400 ° C. the temperature of the slag bath by locally forming a high-temperature portion of 1,500 ° C. or higher in the melting furnace by radiating flame toward the slag bath by a burner In addition, the industrial waste melting treatment facility characterized in that the industrial waste mainly composed of asbestos is melted directly into the slag bath by heat reflected on the inner wall of the furnace. In the industrial waste melting treatment facility according to claim 1,
The industrial waste melting treatment facility characterized in that the oxygen burner is configured to be able to change the radial direction of the soot. One end of the melting furnace is waste such as sludge, iron slag, burning husk, printed circuit board, pad scrap, waste catalyst, metal scrap, waste shot, grinding scrap, dust, etc., charged from the top of the melting furnace. The slag bath is formed in a hot water pool part that is melted by a side burner disposed in the lower part of the furnace and located at a side opposite to the side burner and lower than a hearth part at a position where the waste is charged. The industrial waste mainly composed of asbestos was introduced from the inlet provided in the central ceiling of the melting furnace located on the upper side of the slag bath, and was placed on the ceiling of the melting furnace with the inlet interposed therebetween By radiating soot toward the slag bath with two or more oxygen burners to locally form a high temperature portion of 1,500 ° C. or higher in the melting furnace, the temperature of the slag bath is set to 1,350-1, together with the 400 ℃, Serial asbestos industrial waste directly to the main, and industrial waste melt processing method characterized by melting in the slag bath by the heat reflected from the furnace inner wall. In the industrial waste melting treatment method according to claim 3,
The industrial waste melting method according to claim 1, wherein the slag is lower than the melting point of industrial waste mainly composed of asbestos. In the industrial waste melting treatment method according to claim 3 or 4,
The industrial waste melting method according to claim 1, wherein the slag is copper smelting slag.

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